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OR-Tools
8.2
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The class for variables of a Mathematical Programming (MP) model.
Definition at line 1053 of file linear_solver.h.
Public Member Functions | |
const std::string & | name () const |
Returns the name of the variable. More... | |
void | SetInteger (bool integer) |
Sets the integrality requirement of the variable. More... | |
bool | integer () const |
Returns the integrality requirement of the variable. More... | |
double | solution_value () const |
Returns the value of the variable in the current solution. More... | |
int | index () const |
Returns the index of the variable in the MPSolver::variables_. More... | |
double | lb () const |
Returns the lower bound. More... | |
double | ub () const |
Returns the upper bound. More... | |
void | SetLB (double lb) |
Sets the lower bound. More... | |
void | SetUB (double ub) |
Sets the upper bound. More... | |
void | SetBounds (double lb, double ub) |
Sets both the lower and upper bounds. More... | |
double | unrounded_solution_value () const |
Advanced usage: unrounded solution value. More... | |
double | reduced_cost () const |
Advanced usage: returns the reduced cost of the variable in the current solution (only available for continuous problems). More... | |
MPSolver::BasisStatus | basis_status () const |
Advanced usage: returns the basis status of the variable in the current solution (only available for continuous problems). More... | |
int | branching_priority () const |
Advanced usage: Certain MIP solvers (e.g. More... | |
void | SetBranchingPriority (int priority) |
Protected Member Functions | |
MPVariable (int index, double lb, double ub, bool integer, const std::string &name, MPSolverInterface *const interface_in) | |
void | set_solution_value (double value) |
void | set_reduced_cost (double reduced_cost) |
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Definition at line 1146 of file linear_solver.h.
MPSolver::BasisStatus basis_status | ( | ) | const |
Advanced usage: returns the basis status of the variable in the current solution (only available for continuous problems).
Definition at line 287 of file linear_solver.cc.
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inline |
Advanced usage: Certain MIP solvers (e.g.
Gurobi or SCIP) allow you to set a per-variable priority for determining which variable to branch on.
A value of 0 is treated as default, and is equivalent to not setting the branching priority. The solver looks first to branch on fractional variables in higher priority levels. As of 2019-05, only Gurobi and SCIP support setting branching priority; all other solvers will simply ignore this annotation.
Definition at line 1123 of file linear_solver.h.
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Returns the index of the variable in the MPSolver::variables_.
Definition at line 1074 of file linear_solver.h.
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Returns the integrality requirement of the variable.
Definition at line 1062 of file linear_solver.h.
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Returns the lower bound.
Definition at line 1077 of file linear_solver.h.
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Returns the name of the variable.
Definition at line 1056 of file linear_solver.h.
double reduced_cost | ( | ) | const |
Advanced usage: returns the reduced cost of the variable in the current solution (only available for continuous problems).
Definition at line 278 of file linear_solver.cc.
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inlineprotected |
Definition at line 1158 of file linear_solver.h.
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inlineprotected |
Definition at line 1157 of file linear_solver.h.
void SetBounds | ( | double | lb, |
double | ub | ||
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Sets both the lower and upper bounds.
Definition at line 299 of file linear_solver.cc.
void SetBranchingPriority | ( | int | priority | ) |
Definition at line 317 of file linear_solver.cc.
void SetInteger | ( | bool | integer | ) |
Sets the integrality requirement of the variable.
Definition at line 308 of file linear_solver.cc.
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Sets the lower bound.
Definition at line 1083 of file linear_solver.h.
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Sets the upper bound.
Definition at line 1086 of file linear_solver.h.
double solution_value | ( | ) | const |
Returns the value of the variable in the current solution.
If the variable is integer, then the value will always be an integer (the underlying solver handles floating-point values only, but this function automatically rounds it to the nearest integer; see: man 3 round).
Definition at line 264 of file linear_solver.cc.
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Returns the upper bound.
Definition at line 1080 of file linear_solver.h.
double unrounded_solution_value | ( | ) | const |
Advanced usage: unrounded solution value.
The returned value won't be rounded to the nearest integer even if the variable is integer.
Definition at line 273 of file linear_solver.cc.